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A New Genus of Podonominae (Diptera: Chironomidae) in Late Eocene Rovno Amber from Ukraine

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A New Genus of Podonominae (Diptera: Chironomidae) in Late Eocene Rovno Amber from Ukraine Zootaxa 3794 (4): 581–586 ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ Article ZOOTAXA Copyright © 2014 Magnolia Press ISSN 1175-5334 (online edition) http://dx.doi.org/10.11646/zootaxa.3794.4.9 http://zoobank.org/urn:lsid:zoobank.org:pub:C735111F-81E5-4260-8FBE-777F1E53326F A new genus of Podonominae (Diptera: Chironomidae) in Late Eocene Rovno amber from Ukraine VIKTOR BARANOV1, 2, TROND ANDERSEN3, 4 & EVGENY PERKOVSKY1 1I. I. Schmalhausen Institute of Zoology, National Academy of Sciences of Ukraine, B. Khmelnytskogo 15, 01601 Kiev, Ukraine. E-mails: [email protected], [email protected] 2Present address: Leibniz Institute for Freshwater Ecology and Inland Fisheries, Müggleseedamm 310, 12587, Berlin 3Department of Natural History, University Museum of Bergen, University of Bergen, P.O. Box 7800, N-5020 Bergen, Norway 4Corresponding author. E-mail: [email protected] Abstract The genus Palaeoboreochlus Baranov et Andersen, n. gen. is erected based on P. inornatus Baranov et Andersen, n. sp. described from a male found in Late Eocene Rovno amber. The new genus groups with Boreochlus Edwards in the tribe "Boreochlini". Key words: Diptera, Chironomidae, Podonominae, Palaeoboreochlus, new genus, new species, Eocene, Rovno amber, Ukraine Introduction The subfamily Podonominae Thienemann et Edwards was originally proposed based on several genera from the Northern Hemisphere. The subfamily is currently represented by 14 extant genera with altogether 161 species (Ashe & O'Connor 2009, 2012; Ashe, pers. comm.). Of these, nine genera and 131 species are known from the Southern Hemisphere, while 6 genera and 30 species are known from the Northern Hemisphere with only one genus, Parochlus Enderlein, common to both hemispheres (though the Northern Hemisphere is represented by only a single Holarctic species, Parochlus kiefferi (Garrett, 1925). Two tribes, Boreochlini and Podonomini, are traditionally recognized. However, recent molecular studies (Cranston et al. 2010, 2012) show that while the tribe Podonomini is monophyletic the tribe "Boreochlini" is a non-monophyletic aggregate. Podonominae is a basal subfamily of Chironomidae and is playing an important role in the understanding of the evolution of the family (Cranston et al. 2010). Moreover, after Brundin (1966) published his monograph on transantarctic relationships of austral genera, Podonominae also play an important role in biogeographical studies (Cranston et al. 2012). For a long time Parochlus kiefferi was considered to be the only representative of the Podonomini in the Northern Hemisphere, until Cranston & Edward (1998) re-evaluated the placement of Trichotanypus Kieffer within the Boreochlini. Trichotanypus includes 10 boreal species, three of them Nearctic, five Palaearctic and two Holarctic. The genus Boreochlus Edwards includes seven species: three Nearctic, two Palaearctic and two Oriental. Lasiodiamesa Kieffer comprises one Holarctic, four Nearctic and three Palaearctic species, and the small genus Paraboreochlus is represented by two Palaearctic and one Oriental species (Ashe & O’Connor 2009). A majority of the non-austral Podonominae are inhabitants of the arctic and boreal regions, or occur in cold stenothermic biotopes (e.g. streams, springs) in temperate regions (Brundin 1966). Two of the three Oriental species, Boreochlus burmanicus Brundin, 1966 and B. malasei Brundin, 1966 (Brundin1966), live high in the mountains (2000 m a.s.l.), but the third, Paraboreochlus okinawus Kobayshi et Kuranishi, 1999, occurs on the subtropical Okinawa Island and in the Russian Far East (Ashe & O’Connor 2009). It is well established that the Podonominae in the Mesozoic and Early Cenozoic were much more widespread in the Northern Hemisphere. Podonominae have been recorded from Jurassic deposits in both Siberia and Germany Accepted by B. Rossaro: 21 Mar. 2014; published: 8 May 2014 581 Licensed under a Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0 (Ansorge 1996; Kalugina 1985). These fossils were assigned to Podonominae based on the presence of crossvein MCu and absence of R2+3 on the wings. Furthermore, in Siberian deposits numerous Podonominae-like immatures have been found (Kalugina 1985). The oldest record of Podonominae from fossil resins is Early Cretaceous (Valanginian-Hauterivian) Lebanese amber from Jezzine (about 130 MYA); where Lebanochlites neocomicus Brundin, 1976, according to Cranston et al. (2010), is conspicuously close to extant representatives of the genus Paraboreochlus Thienemann. Three species of Podonominae (Boreochlini), Paraboreochlus bisaetiger Seredszus et Wichard, 2007, Lasiodiamesa sineifoliis Seredszus et Wichard, 2007 and L. eocenica Seredszus et Wichard, 2009, have been described from Late Eocene Baltic amber (Seredszus & Wichard 2011). Below we describe the first Podonominae, Palaeoboreochlus inornatus gen. n., sp. n., from Rovno amber and place it in a new genus. Late Eocene Rovno amber most likely represents the same amber as the Baltic amber from the Gulf of Gdańsk (Szwedo & Sontag 2013). The general scarcity of amphibiotic insects appears to be typical of Rovno amber, clearly seen from the low representation of chironomids compared to the high abundance of insects having terrestrial larvae (Perkovsky et al. 2003, 2010). It is difficult to be certain which habitat was exploited by Podonominae in the Rovno amber forest but it is possible that they inhabited cold springs, which probably were numerous in the Rovno amber forest area, as stated in our previous work (Zelentsov et al. 2012). Material and methods Rovno amber belongs to the succinites, as does the well known Baltic amber (Perkovsky et al. 2010; Zelentsov et al. 2012). The piece of amber containing the holotype is about 15 mm long and 8 mm wide and contains many air bubbles, which to some degree distort the view of the midge inside. The specimen itself is comparatively well preserved (Fig. 1). However, the left wing is lost and the left side of the thorax is almost absent. The apex of the right wing apparently is lacking the membrane; the costa is preserved but the apical parts of M1+2, M3+4 and Cu1 are missing. The fossil was studied using a Nikon Optiphot 2 microscope. The drawings were made with the aid of a drawing tube and processed in Adobe Photoshop CS5. The photos were taken with the aid of a Leica DM 400 B LED microscope using a Leica DFC 450C compact camera. The general terminology follows Sæther (1980). The type is housed in the I. I. Schmalhausen Institute of Zoology, National Academy of Science of Ukraine, Kiev (SIZK), Ukraine. Palaeoboreochlus Baranov et Andersen, gen. n. Type species. Palaeoboreochlus inornatus Baranov et Andersen, sp. n. (present designation by monotypy). Etymology. Named after the related genus Boreochlus, using the Greek palaiois, ancient, as a prefix. Diagnostic characters. The new genus groups with Boreochlus in having a simple gonostylus; flagellum with 14 flagellomeres; a long costal extension reaching the wing tip; no pulvilli; no anal point; crossvein MCu strongly retracted; and reniform, naked eyes. It can be separated from Boreochlus by the comparatively long flagellomere 14, slightly shorter than half the length of flagellomere 13; palpus with palpomere five about 5 times as long as wide; slender, smoothly rounded gonocoxite lacking volsella; and gonostylus with weak, rounded basal heel with few setae on low pedestals, and conical, apical portion without megaseta. Generic diagnosis. Male. Small species, wing length about 1.5 mm. Antenna. Flagellum with 14 flagellomeres. Flagellomere 14 slightly less than half the length of flagellomere 13, flagellomere 13 slightly longer than the length of fagellomeres 7–11 together. Plume well developed. Apex of flagellomere 14 apparently with several sensilla. Head. Eye reniform, naked. Orbitals present. Palp with five palpomeres, length ratio between palpomeres 2–5 as: 0.20 : 0.27 : 0.24 : 0.29. Thorax. Scutal setation well developed, details poorly observable. Wing. Membrane with coarse punctuation, setae not observed. Costa extended, ending near wing tip. MCu weak, strongly retracted, situated at about 1/3 the distance between arculus and RM. FCu slightly distal to RM. Legs. LR1 0.68. Tibial spurs with basal denticles. Tibial comb of several setae. Pulvilli absent. 582 · Zootaxa 3794 (4) © 2014 Magnolia Press BARANOV ET AL. Hypopygium. Abdominal segment IX well developed; without anal point. Gonocoxite slender, smoothly rounded, with setae along inner margin. Gonostylus simple, with weak, rounded basal heel with few setae on low pedestals, and conical apical portion, with distinct y-seta at base, without megaseta. Systematics The new genus will key to the genus Boreochlus in both Brundin (1966) and Brundin (1989) as it has a long costal extension reaching the wing tip; no pulvilli; no anal point; crossvein MCu strongly retracted; and reniform, naked eyes. However, it differs from Boreochlus in several hypopygial features. The gonocoxite is rather slender and smoothly rounded, with setae along the inner margin, but without a vertical volsella armed with a conspicuous group of numerous, more or less stout setae as in Boreochlus. The gonostylus is stouter than in Boreochlus with a much stronger basal swelling with setae sitting on low pedestals, and the apical part of the gonostylus is not as slender as in most Boreochlus species. The new genus is also apparently lacking a megaseta, although it seems to have a quite strong y-seta. The antennae also
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